Remove unneeded KConfigDialogManager::changedMap

SymbolConfigListWidget does not exist

src/main.cpp

@@ -74,8 +74,6 @@ int main(int argc, char **argv)
 
 	KCrash::initialize();
 
-	KConfigDialogManager::changedMap()->insert(QStringLiteral("ksudoku::SymbolConfigListWidget"), SIGNAL(itemChanged(QListWidgetItem*)));
-
 	// see if we are starting with session management
 	/*if (app.isRestored())
 	{